Streaming flow by oscillating bubbles: quantitative diagnostics via particle tracking velocimetry

Bolaños-Jiménez, R.; Rossi, Massimiliano; Rivas, David Fernández; Kähler, Christian J.; Marin, Alvaro

doi:10.1017/jfm.2017.229

Cited by 37 publications

(33 citation statements)

References 47 publications

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“…Near the oscillating meniscus, a vortex ring is observed, i.e., at the axisymmetry axis (x = 0) of the ink channel, the flow is directed upward in the positive y direction and it recirculates off axis. Acoustic streaming near an oscillating interface is a well-known phenomenon [43] and it results in a vortex ring [44][45][46]. Note, by comparison of Figs.…”

Section: E Dirt-particle Trapping and Ink Velocity Fieldmentioning

confidence: 94%

Inkjet Nozzle Failure by Heterogeneous Nucleation: Bubble Entrainment, Cavitation, and Diffusive Growth

Fraters

Berg²,

Loore³

et al. 2019

Phys. Rev. Applied

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Piezoacoustic drop-on-demand (DOD) inkjet printing is widely applied in high-end digital printing due to its unprecedented precision and reproducibility. Micron-sized droplets of a wide range of chemical compositions can be deposited; however, the stability of piezoacoustic DOD inkjet printing can sometimes be compromised through the stochastic entrainment of bubbles within the ink channel. Here, bubble nucleation, translation, and growth are studied in an experimental silicon-based printhead with a glass nozzle plate using high-speed imaging that is triggered by changes in the ink-channel acoustics. It is found that impurities in the ink can trigger bubble nucleation upon their interaction with the oscillating meniscus. Cavitation inception on a dirt particle during the rarefaction pressure wave is identified as a second mechanism for bubble formation. The acoustic driving pressure within the ink channel, and its change upon bubble nucleation, are obtained from a fit of a Rayleigh-Plesset-type bubble-dynamics equation to the measured time-resolved radial dynamics of the bubble. The measured decrease in channel resonance frequency after bubble entrainment results in a 24% increased ink-jet length. The nucleated bubbles translate toward the ink-channel walls due to acoustic radiation forces and ink streaming. The convective ink flow is characterized using high-speed particle-tracking velocimetry. The vortical flow near the oscillating meniscus is shown to trap the impurities, thereby increasing the particle-to-meniscus interaction probability and, correspondingly, the bubble-entrainment probability.

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Section: E Dirt-particle Trapping and Ink Velocity Fieldmentioning

confidence: 94%

Inkjet Nozzle Failure by Heterogeneous Nucleation: Bubble Entrainment, Cavitation, and Diffusive Growth

Fraters

Berg²,

Loore³

et al. 2019

Phys. Rev. Applied

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“…173,174 Ultrasound has been used to enhance the rate of electrochemical processes by increasing mass transfer in the liquid electrolyte due to the acoustic streaming, and in some cases by actively removing bubbles from electrodes during reactions. 175,176,177,178,179,180,181 More specifically, the complex phenomena associated to sonication can disrupt the diffusion layer, enhance mass transfer of ions through the double layer, and enhance the activity of the electrode surface (see Figure 12). Under ultrasonic irradiation, and below a specific acoustic power (depending on pressure amplitude, frequency, gas concentration in the liquid, etc.)…”

Section: Acoustic Fieldsmentioning

confidence: 99%

Influence of Bubbles on the Energy Conversion Efficiency of Electrochemical Reactors

Angulo

Linde

Gardeniers

et al. 2020

Joule

481

374

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Bubbles are known to influence energy and mass transfer in gas evolving electrodes. However, we lack a detailed understanding on the intricate dependencies between bubble evolution processes and electrochemical phenomena.This review discusses our current knowledge on the effects of bubbles on electrochemical systems with the aim to identify opportunities and motivate future research in this area. We first provide a base background on the physics of bubble evolution as it relates to electrochemical processes. Then we outline how bubbles affect energy efficiency of electrode processes, detailing the bubble-induced impacts on activation, ohmic and concentration overpotentials.Lastly, we describe different strategies to mitigate losses and how to exploit bubbles to enhance electrochemical reactions. Context & ScaleElectrochemical reactors will play a key role in the electrification of the chemical industry and can enable the integration of renewable electricity sources with chemical manufacturing. Most large-scale industrial electrochemical processes, including chloro-alkali and aluminum production, involve gas evolving electrodes. The evolution of bubbles at the surface of redox reaction sites often lead to the reduction of the active electrode area, the increase of ohmic resistance in the electrolyte and the formation of undesirable concentration gradients. All of these effects result in energy losses which reduce the efficiency of electrochemical systems. This review synthesizes our current understanding on the relationship between bubble evolution and energy losses in electrochemical reactors. By presenting a thorough account on the state of the research in this area, we aim to provide a common ground for the research community to improve our understanding on the complex processes involved in multiphase electrochemical systems. Increasing our knowledge on the relationship between bubbles and electrochemistry will lead to new strategies to mitigate and exploit bubble-induced phenomena leading to design guidelines for high-performing electrochemical reactors.

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“…In the southeast of the Caribbean, between November and March, sperm whales are consistently found (Ward et al, 2001). Sightings and strandings of sperm whales have also been reported off Venezuela (Bolaños-Jiménez and Villarroel-Marín, 2008a). Three at-sea sightings were reported for French Guiana in October (Mannocci et al, 2013).…”

Section: Species Accountsmentioning

confidence: 89%

Cetaceans observed in Suriname and adjacent waters

Boer

2015

Lat. Am. J. Aquat. Mamm.

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Abstract. Very little information exists about the cetaceans in the Guianas: Suriname and its neighboring countries Guyana and French Guiana. During a dedicated cetacean survey carried out from a geophysical seismic survey vessel in the offshore waters of Suriname (May-September 2012), the occurrence of 13 cetacean species was documented and of those, 11 were newly documented for this area. The species observed by the author included sperm whale (Physeter macrocephalus), Bryde's whale (Balaenoptera edeni), false killer whale (Pseudorca crassidens), melon-headed whale (Peponocephala electra), roughtoothed dolphin (Steno bredanensis), long-beaked common dolphin (Delphinus capensis), Fraser's dolphin (Lagenodelphis hosei), pantropical spotted dolphin (Stenella attenuata) and spinner dolphin (Stenella longirostris). During transit to the survey area (Trinidad to Suriname) incidental sightings were recorded which included common bottlenose dolphin (Tursiops truncatus) off Trinidad, Stenella sp. off Guyana and Guiana dolphin (Sotalia guianensis) at the entrance of the Suriname River. Opportunistic records originating from the periods December 2008-March 2009 and August-October 2012 were forwarded to the author. These records included common bottlenose dolphin, Atlantic spotted dolphin (Stenella frontalis) and short-finned pilot whale (Globicephala macrorhynchus).There is a growing need to identify critical areas for marine biodiversity conservation, both locally and regionally. This paper describes the general occurrence of the cetacean community encountered in Suriname waters in summer. The study revealed that the offshore cetacean community in Suriname is best described as primarily a tropical community, dominated by odontocetes (dolphins and sperm whales). Although the species diversity was relatively high, the overall cetacean relative abundance index (number of animals per 100km effort) was low, which is consistent for tropical equatorial offshore waters. Apart from the sperm whale and the Guiana dolphin, all the other species recorded represent new species records for Suriname. It is recommended that more continuous monitoring in different seasons be carried out in order to gain a better understanding of the occurrence, distribution and status of the different cetacean species within the region.Resumo. Pouca informação encontra-se disponível acerca de cetáceos nas Guianas: Suriname e seus países vizinhos, Guiana e Guiana Francesa. Durante um levantamento dedicado de cetáceos conduzido a partir de uma embarcação de sísmica nas águas de mar aberto do Suriname (maio-setembro 2012), a ocorrência de 13 espécies de cetáceos foi documentada, sendo 11 delas novos registros para aquela área. As espécies observadas pela autora incluíram cachalote (Physeter macrocephalus), baleiade-bryde (Balaenopter edeni), falsa-orca (Pseudorca crassidens), golfinho-cabeça-de-melão (Peponocephala electra), golfinho-dedentes-rugosos (Steno bredanensis), golfinho-comum-de-bico-longo (Delphinus capensis), golfinho-de-fraser (Lagenodelphis h...

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Streaming flow by oscillating bubbles: quantitative diagnostics via particle tracking velocimetry

Cited by 37 publications

References 47 publications

Inkjet Nozzle Failure by Heterogeneous Nucleation: Bubble Entrainment, Cavitation, and Diffusive Growth

Inkjet Nozzle Failure by Heterogeneous Nucleation: Bubble Entrainment, Cavitation, and Diffusive Growth

Influence of Bubbles on the Energy Conversion Efficiency of Electrochemical Reactors

Cetaceans observed in Suriname and adjacent waters

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